Uploaded 3 more concept on an image hosting site since contest is over 5 minutes now and i didnt get to upload mine >.>
http://imageshack.us/photo/my-images/197/usfreightmode5l.jpg/
http://imageshack.us/photo/my-images/717/usfreightmodel2.jpg/
http://imageshack.us/photo/my-images/607/usfreightmodel3.jpg/

Good luck to all and sorry for the late entries that will or won't be considered :D